EM73P361AH データシートの表示（PDF） - ELAN Microelectronics

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EM73P361AH

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73P361A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

TIMER/COUNTER FUNCTION

Each timer/counter can execute the timer function independly.

TIMER MODE

For timer mode ,timer/counter increase one at any rising edge of internal pulse . User can choose 4 kinds

of internal pulse rate by setting IPSB for timerB (IPSA for timerA).

When timer/counter counts overflow, TRGB (TRGA) will be generated to interrupt control unit.

Internal pulse

TimerB (TimerA )value n n+1 n+2 n+3 n+4 n+5 n+6 n+7

PROGRAM EXAMPLE: To generate TRGA interrupt request after 60 ms with system clock XlN=32K Hz

LDIA #0100B;

EXAE; enable mask 2

EICIL 110111B; internupt latch ← 0, enable EI

LDIA #04H;

STATAL;

LDIA #0CH;

STATAM;

LDIA #0FH;

STATAH;

LDIA #1000B;

OUTA P28; enable timerA with internal pulse rate: XIN/25 Hz

NOTE:

The preset value of timer/counter register is calculated as following procedure.

Internal pulse rate: XIN/25 ; XIN = 32KHz

The time of timer counter count one = 25 /XIN = 32/32K=1ms

The number of internal pulse to get timer overflow = 60 ms/ 1ms = 60 = 03CH

The preset value of timer/counter register = 1000H - 03CH = 0FC4H

INTERRUPT FUNCTION

There are 3 internal interrupt sources and 2 external interrupt sources. Multiple interrupts are admitted

according the priority .

Type

Interrupt source

Priority Interrupt Interrupt

Program ROM

Latch

Enable condition entry address

External External interrupt (INT0)

1

IL5

Internal Reserved

2

IL4

Internal TimerA overflow interrupt (TRGA) 3

IL3

Internal TimerB overflow interrupt (TRGB) 4

IL2

Internal Time base interrupt(TBI)

5

IL1

External External interrupt (INT1)

6

IL0

EI=1

EI=1, MASK3=1

EI=1, MASK2=1

EI=1, MASK1=1

EI=1,MASK0=1

002H

004H

006H

008H

00AH

00CH

* This specification are subject to be changed without notice.

12.17.2001 15

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